Tuesday, May 06, 2008

...zip up your anorak and prepare to get your teeth into some real technical stuff. Each of the elements in a well-designed test card has a reason for being there and this page, which includes extracts from BBC and IBA information sheets and articles derived therefrom, attempts to explain exactly what their purpose is.

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When you can measure what you are speaking about, and express it in numbers, you can know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind: it may be the beginning of knowledge but you have scarcely, in your thoughts, advanced to the stage of science.